Watch-case spring



(ModeL) J. E. KETGHEM & T. C. NIXON.

WATCH CASE SPRING.

No. 476,748. Patented June 7, 1892.

lNVENTOHvE JTEZqZFwm 1T 0. J fvacom By ATTORNEYS mans cm, Puma-m0,msumcwu n c UNITED STATES PATENT OFFICE.

JOHN E. KETOHEM AND THOMAS C. NIXON, OF MORRILLTON, ARKANSAS.

WATCH-CASE SPRING.

SPECIFICATION forming part of Letters Patent No. 476,748, dated June'7', 1892.

Application filed November 21,1891. Serial No. 412,689. (ModeL) To allwhom it may concern:

Be it known that we, JOHN E. KETCHEM and THOMAS C. NIXON, of Morrillton,in the county of Conway and State of Arkansas, have invented a new anduseful Improvement in WVatch-Case Springs, of which the following is aspecification.

The object of our invention is to provide a simple, eifective, andeasily-adjusted device for securing within the case of the Watch thespring which opens or throws back the hinged leaf of the case or looksit closed; and to this end it consists of a spring provided with astifliy-tnrning rivet or screw having its head provided with anick orother means for turning the same and having on ea -h of its oppositesides a projecting lip, whose outer portion is sharpened to a knife-edgeand is adapted,when turned, to bury into the metal of the bezel and holdthe spring in place with apositive and firm connect ion, as will behereinat'ter fully described.

Figure 1 is a sectional view of the watchease, showing the position ofthe lift=spring in relation to the hinged leaf. Fig. 2 is an enlargedinside view of the spring. Fig. 3 is a cross-section through line 3 3 ofFig. 1.

In the drawings, A represents the spring to r raising the hinged leaf.This spring is of the ordinary shape and is adjusted in the ordi naryplace within the case of the watch. Extending through this spring aboutits middle we provide a rivet orserew (1, whose head has sharpened lipsZ) on its sides and a nick to permit it to be turned by a screw-driver;or in the place of thenick itmay have a square or o'her shaped head topermit it to be turned by a wrench or tool of similar shape. The springis applied with the lips of the rivets or screws turned away from theedge of the spring, and then when the spring is in place the rivet orscrew is turned so as to throw the sharpened lips into the metal formingthe bezel of the ease, and thus lock the spring firmly to its place.

The object in having the outer edgesof the lip orlips sharpened to aknife-edge is to cause them to bury in the metal of the bezel, and thushold at any point with a perfectly-tight and firm connection. \Vhen thedouble flanged construction shown in Fig. 2 is turned to the lockingposition, as shown by dotted lines, the parts are locked with the rivetin the line of the dead-point, so that there is no effect of leverage totend toward the loosenv ing of the device.

Our device is distinguished from the ordinary half-headed screw in thatthe sharp flanges extend beyond the head of the screw and burythemselves in the metal.

We are aware that a slotted lever has been riveted to a watch-easespring, so as to be turned to lock the spring in the case, as shown byPatent No. 196,609, and we make no claim to this construction.

Having thus described our invention, What we claim as new is Thewatch-case spring provided with aswiveling rivet or screw having itshead nicked or adapted for turning and having two sharpedged lipsextending beyond the head in diametrically-opposite directions,substai'itially as shown and described.

JOHN E. KE'lOHEM. THOMAS C. NIXON. Witnesses:

R. M. DASHIELL, JNo. W. IEvINE.

